Sounds like the pins and needles could be a trapped nerve in the top of your spine/neck and that could cause tinnitus also.
You might also be picking up the pulse from your coroted artery that is right by your middle ear.
Keep pushing for information and tests.
Also if you have any jaw problem like grinding teeth you could read up on TMJ.....just a couple of ideas for you that might need looking in to as ENT and MRI was ok....lots of love glynis

"Look for the happy things in life and don't let tinnitus take away your smile or laughter"